Ah yes! EDI, I have seen this before.
The first thing to check (if all the lights are doing it) is the line voltage. If it is too high, this will throw off the ramp generators (they run 24/7 unless the power is cut off.) By high, look for 127 to 132
volts. EDI uses a parabolic
dimmer curve, it doesn't take too much to really throw it.
The second thing that comes to mind (Especially if they are all in one pack) is the low end
trim pot. If it gets noisy / dirty it can cause this to happen. If it has, the temporary solution sounds stupid, but here it is: Slap the dimmer pack with your fist! Usually, the vibration will be enough to quiet the trim pot down. If this works, you want to have it serviced of the problem will come back.